Differential Capacity Voltage Relaxation Analysis for Detecting Low Temperature Plating
Differential capacity voltage relaxation analysis detects sub-zero lithium plating by identifying chemical re-intercalation peaks during post-charge rest.
24-Bit Voltage Acquisition
Meaning
High-resolution analog-to-digital conversion provides the precise voltage measurements required to track minute changes in battery cell potential. Implementing 24-bit voltage acquisition allows diagnostic equipment to resolve differences down to the microvolt level. The technique is applied in precision battery cyclers and battery management systems where subtle electrochemical changes must be detected.
Measurement Precision
Signal resolution limits the accuracy of open circuit voltage curves. Utilizing 24-bit voltage acquisition ensures that the digitization noise remains far below the electrochemical response of the cell. This low noise floor is necessary for detecting the phase transitions of active materials.
The data helps engineers build accurate state-of-charge algorithms.
Incremental Capacity
Differential capacity curves are highly sensitive to measurement noise. Sourcing and validation laboratories rely on 24-bit voltage acquisition to produce smooth incremental capacity plots without heavy digital filtering. This capability permits the early detection of active material loss.
It also identifies lithium plating during fast charging before any capacity loss becomes visible.
Hardware Design
Analog front-end circuits must minimize drift to preserve the high resolution of the converter. The hardware for 24-bit voltage acquisition employs low-noise voltage references and shielded differential signal paths. These components prevent electromagnetic interference from distorting the readings.